Higher display frequencies (120Hz, 180Hz, 240Hz). The VSYNC indicator will automatically switch to multiple VSYNC indicators to support The performance graph is green (indicating ALL frames are being generated on time)Īnd this indicator shows red/cyan, then you know that the webīrowser has a VSYNC synchronization problem. Indicator was caused by a frame being rendered late. In the performance graph, it is likely that any color flickering in this In other words, when there is a red spike Late inter-frame callbacks (no red line). TIP: Only rely upon this indicator when the performance graph (below) shows NO Pixel response times (as pixels are transitioning from 'on' to 'black/off' faster). 'rgb' value (that causes 'VSYNC' to blend into the background) has the faster Relative pixel 'response time' between two displays. So that the word 'VSYNC' you see will blend into the indicator background.Ī very interesting side effect is that this actually allows you to compare the Rgb: Customizes the indicator background gray level (where 0 is black 255 is white). Rendering frames fast enough see the performance graph below). The web browser is NOT properly synchronized to the display's VSYNC signal (or not However, when you see either red or cyan for a brief moment, then
When the 'VSYNC' indicator (word) appears as a flickering gray, that indicates proper VSYNC Easy!Ĭlick on the 'gear' icon at the top of the web pageĪnd the following test options will be presented (or hidden). You absolutely know that the web browser is not properly VSYNC aligned. However, if you look at 'VSYNC' and you sometimes see a flickering red or cyan, then Only see (flickering) gray, you absolutely know that rendered frames are being displayed properlyĪligned to VSYNC. In summary, for a web browser that is easily producing 60 fps, if you look at 'VSYNC' and RAF callback rate, we can discover the underlying VSYNC hertz (provided the web browser Which is part of HTML5 - and internally, all web browsers attempt to synchronize the rAFĬallbacks to the monitor's VSYNC signal. (eg: red+cyan=white, or FF0000+00FFFF=FFFFFF) that virtually all computer displays use. This solution takes advantage of (1) requestAnimationFrame() in HTML5 and Please note that viewingĪngle can also significantly affect the amount of flickering seen. Response times of your display, and your viewing angle. (flickering) gray! The precise level of gray your eyes see depends upon the pixel High speed photos clearly show that the display is in fact alternating betweenĭisplaying red and displaying cyan. If even a single frame is missed/dropped, your eyes easily detect/see 'VSYNC' appears to your eyes on the display as a flickering gray. which can only happen when a browser IS properly VSYNC aligned. How the VSYNC synchronization tester worksĭisplay a red 'VSYNC' image for one frame (1/60 of a second) followed by a cyan 'VSYNC' imageįor the next frame (1/60 of a second), and repeat over and over.Īs long as there is NO interruption in this alternating frequency to the display
#Isyncer instructions manual
Manual - How it works "VSYNC synchronization" Tester Manual
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